Heating device



C. L. BRYANT HEATING DEVICE Feb. 20, 1940.

5 Sheets-Sheet 1 Filed April 17, 1936 chu-1w Lfgant INVLNTQQ Feb. 2o,1940. c. L. BRYANT 2,190,768

HEATING DEVICE @harlea LCBargantT lNwLN TOR ATTOQNLT?,

Feb, 20, 1940. c. L.. BRYANT 2,190,768

HEAT ING DEVI CE Filed April 17. 1956 5 SheetFs-)Sheet 3 H4 @df ChachaBraamt I N vLN TOR ATTORNLe C. L. BRYANT HEATING DEVICE Feb. 20, 1940.

Filed April 1'7, 1935 5 Sheets-Sheet 4 Chars Iza I Bryant l N VLM-ro QFeb. 20, 1940. C, BRYANT 2,190,768

HEATING DEVICE Filed April 1v. 1936 L Bryant INvLNToR Br Patented Feb.20, 1940 HEATING DEVICE Charles L, Bryant, Cleveland, Ohio, assigner toG. L. Bryant Corporation, Cleveland, Ohio, a

corporation of Ohio Application Apriti?, 193s, serial No. '14,929

20 Claims.

This invention relates to heating devices, more particularly to devicesadapted to be used with furnaces, and of the typeusing fluid fuel as asource of heat energy, and the object of this `invention is to providenew and improved devices of these types.

In the drawings accompanying this speciiication and forming a part ofthis application, 'I

lo., have shown, for purposes of illustration, seveial u forms which myinvention may assume, and in these drawings:

Figure 1 is a vertical sectional view of one all in the embodiment ofthis invention,

Figure 6 is a vertical sectional view similar to Figure l, butillustrating a differentembodiment of the invention,

d substantially to the line 1-1 of Figure 6,

Figure 8 is a vertical sectional view of another #embodiment of theinvention, parts being broken away and parts being shown in elevation,this view corresponding generally to the line 8 8` of Figure 9,

Figure 9 is a horizontal sectional view, partly in elevation,corresponding substantially to the line 9 9 of Figure 8,

Figure l0 is a vertical sectional view correi0 spending substantially tothe line IU--I of Figure 9,

Figure 11 is a vertical sectional view similar to Figure 8, butillustrating still another eml bodiment of the inventionyand l Figure 12is a horizontal sectional View corresponding substantially to the line12--12 of Figure 11.

The embodiment of the invention disclosed in Figures l through 5 isparticularly suitable for use with a furnace 20, which has an ash-pit2l, and a fire-box 22, the ash-pit and fire-box here being onlyfragmentarily shown. The'ash-pit 2l is offset' with respect to thefire-box 22 to form a shoulder 23.

As here shown, a fuel supply pipe 24 extends Figure 5 is a perspectiveview of a burner used Figure l is a horizontal section corresponding`into the ash-,pit 2|, and is connected by an elbow 25 with an upstandingpipe section25, the upper end of the latter `being connected withmanifold means 21, which in turn has connection with a burner member`28. `The manifold means `21 comprise a plurality of connectedindividual manifoldsy 29, the number of manifolds used `de-` pendingupon the amount of heat to be supplied. inasmuch as allof the manifolds29 are` alike, only one will be described in detail. I l

The manifold 29 comprises an elongated chambered member preferablyformed as bycasting. The manifold 29, in transverse section, has arounded lower wall 30, generally parallel vertical walls 3l and 32, atop wall 33a wall 35i anguiarly extending from the vertical ,wall 3l,spaced and generally parallel to the top Awall `33, and a wallconnecting the angular wall 34 with the topwa11 as. The vertical wailstas shown in Figure 31, stops shortof the top wall `33.` Theconstruction of the manifold thus` described provides `two elongatedtroughs closed from communication with the exterior ofthe manifold bymeans of integral end walls 33 spanning the ends of the troughs to formcham-` bers 31 and 38, and the end walls 36 are provided withscrew-threaded apertures 35i. The elongated chambers 31 and 38communicate throughout their length, the chamber 31 being considerably`smaller in cross` sectional area than the chamber 38and having itsbottom Wall 3ft disposed above the bottom wall 30 of the chamber 38, Thebottom wall 30 of the chamber 38 is also provided with a screw-threadedopening to` receive the screw-threaded extremity of the fuel supplypipe2'6. 'I'he vertical wall 32 isprovided with a screw-threaded openingwhich may be used to connect the manifold 29 to another manifold 29, butinthis instance the screwthreaded opening is closed by a `plug 40. Inusual practice, when it is desired to connect together a plurality ofmanifolds 29, coupling pipes 4I are threaded into apertures 39 ofadjoining known means,` one preferred `means including the members 42integrally with the manifold. Each of the members 42 provides a mixinglchamber 43, into which air is drawn through a plurality of arcuateopenings 44 formed in the nat front face e5 `of the respective member ELrThe adjusting plate 4'! may further be provided with a peripheralflange engageable with the periphery of the front face 45, and maybeheld in any desired adjusted position by any well machine screw passingthrough an arcuate slot in the adjusting member and threading into ascrew-threaded aperture formed yin an ear i8 integrally cast with thefront face 45.. .The quantity of vair being mixed with the fuel in thechamber d3 may beregulated by opening or closing the openings M in thefront 'face 45 by proper movement of lthe adjusting plate el.Communication between the mixing chamber 43 and the chambers 3l' and 3Sis effected by a nozzle orifice screw-threadedv into the wall 35 andaligned with the axis ofthe mixing chamber 43. l

A burner member 25 is adapted to cooperate with each mixing chamber 53of the manifold` 29, and as best shown in Figure 1, the burner member 28comprises a tubular portion 49, hav? ing an extremity 55 fitting withinthe aperture formed in the boss 65 of the member 42, and held inposition by means of` a setl screw 5l threaded into and passing througha walll of the boss 46. Inserting movement of the extremity 50 islimited by a shoulder spaced inwardly on the tubular portion i3. 'I'heother extremityof the tubular portion tapers gradually to a widened part52, and at this part the vburner mem? ber is provided with an upwardlyextending burner mouth 53, which as bestshown in Figure' 5, is'generallyrectilinear and elongated in a plane transverse to the axis of theVtubular portion 49,v and the burner mouth 53 tapers' as it extends up-Wardly to provide a narrow elongated burner opening 54. To betterdescribe the burner mouth, a face view would appear to be wing-shaped orgenerally V-shaped.

Spaced from the burner mouth 53 is` an upstanding ear 55, provided witha serew-tl'ireadedl aperture 56, and disposed between the burner mouth53 and the ear 55 is a transversely ex` 5l, generally in line with theweb 55 is a pair of abutments 5l, and projecting from the burner mouthy'towards the ear 55 is' a lug 62 havingan inclined face 53 spaced fromthe ear 55.

Carried by the burner member 2B is a baille means ,65, comprising a pairof spaced plates. 65 and 66, integrally connected at their longitudinalends by end walls 5l' and 53 to form an Yelongated rectangularly shapedchamber 59, as best shown in Figure 2. Referring particularly to Figure4, it will be noted that the wall 65 projects somewhat below the'wall 56to provide a projecting leg l0.l The wall 65, at its lower extremity,lis

the top surface of the ledge provided with an angularly extending ledgell, and at its upper extremity with curved lip 'i2 partially overhangingthe upper portion of the chamber 69. The end walls 57 and 58 extend onlythe length of the wall 65, the wall 5l being provided with a tongue "i3,and the wall 613 being provided with a groove lli, the tongue and grooveconstruction providing for interconnection with adjoining baille means65.

As best shown in Figure l, the leg lil, of a bai-f ne means t4, isdisposed within the space eiined byfthe inclined face 53 of the lug 52and the adjacent face of the ear 55, the leg lll resting on It will benoted that the space provided by the face S3 and the ear Y55 isconsiderably greater than the thickness ofthe leg lll. To hold thebaille means in a desired position, a bolt 'l5 isI threaded into the'threaded aperture 55 of the ear 55, and proper l El 54, and the fuelsupply conduit 25 is connected to the elbow 25. The elbow 25 is providedwith ardownwardly extending internally threadedy tubular part Tl, whichscrew-threadedly engages a 5 screw-threaded rod 'i8 forming a part of astandard means l5. The standard means 'l5 further includes a foot 85,provided with an elongated tubular part having a screvwthreaded aperture8| which receives the lower end of the rod 18, and provides for verticaladjustment of the entire heating device with respect to the furnace 25.i

c Referring to Figures 2, fl, and 5, it will be noted that the lateralextent of the walls 55 and 65 is substantially equal to the lateralextent of the channel 53, so that one b rner 2li and one baille means 55will constitute a unitary assembly. If only one manifold 29 is used,the` apertures 3G areplugged and the fuel conduit is connected to theaperture in the bottom wall Sil, and a burner member Z5 is properlyconnected to each of the bosses i5 of the The baule means 64 are thenr`disposed. in proper relation with the burner members 2li, with theadjacent tongue and groove formed thereon in mating relation. One endof'a is then bolted tothe ledge 5S, the other end bearing against theabutment 23 formed on the furnace An.- other plate 83 is disposed so asto have its one end carried by the ledge 'li of the baille means and itsother end carried by an abutment on the fur-v nace, or by ledges formedon baille means disposed at the other side of tbe furnace. The plates 82and 83 separate the furnace into a lower compartment and an uppercompartment, and passage of air from the lower compartment to the uppercompartment is effected only by the passage through the baffle means5ft.

From the foregoing description it will be evident that in operation ofthe furnace, primary air will be mixed with the fuel, which. in thisparticular instance is' gas, in the mixing chambers 43 associated withthe manifolds Z5, and this mixture is burned at the burner opening 5d.Secondary air will be drawn upwardly from the ash-pit 2l, and escapesonly through the cham*- the llame by the lips 12 and willreadilyucombine j struct these baffle means.

with any` unburned gases at the tip of the name to forma combustiblemixture that will ignite and furnish further heat, and also producecombustion relatively unaccompanied by unburned gases andundesirablesoot. Also, by reason `of the passage of air through thefchambers B9, the `baille means G4 will not become overheated, and

cheaper and lighter material may be used to con- Because of theparticular construction ofthe burner opening 54,. the fiameissuingtherefrom will be in the shape of a narrow elongated sheet, and heatenergy from this flame will be'deflected towards the fire-box by reasonof the `adjacent disposition of the inclined baflie means 64. It will fbefore.

tion, it will be obvious that the construction on now of fuel is turnedto off position, the flame at the burner mouth 54' is `prevented fromflashing back to the manifold chamber 38 and fuel supplyconduit 24 byreason of the interposition of the vertical wall 3| in the passagenormally traversed by such a ash back ame. It will be appreciated thatthe vertical Wall 3| interrupts such flash back, and thereby avoids adangerous condition common to the ordinary type of burner. In addition,air which may enter the burner opening 54 and the mixing chamberopenings 44 is prevented from entering the manifold chamber 38 andsupply conduit 24 when the` fuel control valve is in off position,because the air will first enter the chamber 31 and settle to the bottomof the `chamber and be trapped therein for the reason `that the air isheavier than the fuel gas `commonly used, and willdisplace this gas inthe` chamber 31. The air in the chamber 31 forms an air seal which sealsthe orice opening in the mixing chamber 43, and prevents any gasremaining in the chamber 38 or conduit `2|; to pass to the mixingchamber 43,; thus, after the gas in the` burner 28 `is consumed, theflame cannot flash back to the mixing chamber, for the reason that therewill be no gas in this mixing chamber.Y

Referring to the embodiment disclosed in Figures 6 and '7, the manifoldmeans herein shown comprises a manifold 84 in some respects similar tothe manifold 29, in that chambers 85 and 86 and mixing chambers 81 areprovided which are similar to the chambers 31 and 38, and mixingchambers 43, heretofore described. As before,

the chamber 85 is disposedon one side of the'` 88, similar to thechamber 85 is provided on the other side of the chamber 85, and thechamber 88 `communicates with a mixing chamber 89 as Therefore, from theforegoing descripone side of the centerline of the manifold is similartothat on the `other side, and in this instance, the manifold 84 isprovided with pairs of axially aligned mixing chambers 81 and 89, whichhave connections to burner `members 280l and bale means 64a in the samerelation described in connection `with the embodiment disclosed inFigures 1 through 5.` `In this embodiment,'the chamber 86 receives thefuel from a supply conf- `standard means 19a.

" The embodiment disclosed in Figures 8 through l 10 comprises amanifold90, arcuate in plan'view, and used particularly in furnaces having anonrectangular fire-box. The manifold 90 provides a generally `closedchamber 9|, which is locally interrupted on the outer wall at the upperex tremity thereof at spacedpoints 92. Communicating With theinterrupted parts 92 of the outer wall of the chamber 9|, areradiallyextending chamberedhousings 93,2integr`ally cast With themanifold 90, and completely enclosing the interrupted parts 92.Extending radiallyfrom the housings 93, andv cast integrally-therewith,are semi-spherical chambered members 94, ywhich have` 4their mixing`chambers 95 communicating with the interior ofthe chambered housings 93through orifice nozzles 98. The chambered members 94 are provided withopenings and bosses similar to the members hereinbefore described, andthe amount of air admitted to the mixing chambers 95 is regulated byapertured adjusting plates as before.

As best shown in Figure 9, themanifold 98 is provided with four radiallyextending mixing chambers 95. The ends of the manifold are provided withapertured ears 91 which may be secured to suitable connecting means tohold the manifold` 99 to the walls ofthe furnace, or to another manifold99. As before, the chamber 9| receives its fuel from -a supply conduit`24h, 4and the conduit and the entire burner mechanism may be adjustedlongitudinally of the furnace by a standard means 19h. If more than onemanifold 9U is used, fuel may be supplied to the other manifold 90 by asuitable connection with the supply conduit 24h and the other manifoldmay be adjusted bythe use of a standard means sim-- ilar to the standardmeans 19h. In some instances, it may be` desirable to run a conduitbetween the inner walls of the manifolds to be connected, and for thispurpose the inner` walls are provided with threaded apertures 98 whichare normally closedV by plugs 99.

In this embodiment the burner members 28h are somewhat similar to theburner members 28, but differ in the respect that the burner mouths 53hare arcuately shaped to` `conform generally means 64b are laterallycurved and are connected i to each other by the tongue and groove jointsto form an arcuate baffle device. The channel portions 58b, in thisinstance, cooperate with the channel portions of the adjacent bafflemeans to provide an arcuate channel to which the plate 82h is attached.'Ihe plate 83h rests on the arcuate shoulderformed by the ledges 1 IbIof the cooperating baie means 54h. The plates 821) and 83h, as before,separate the furnace into upper and lower chambers. In some instances,when the manifolds 99 do not forma complete annulus. suitable platemeans (not shown) are secured to the plates 82h" and 83h to prevent thesecondary air from following av course other than through the chambersin the baffle means 84h;

The operation of the construction shown in Figures 8 through 10 isgenerally similar to that described in the embodiment disclosed-inFigures l through 5, the interruptions 92 in the outer wall of thechamber-9| providing bailiemeans to prevent ash back of the flame fromthe burners 28h to the manifold chamber 9|. Also, the chambered housings93 provide pockets into which air infiltrating through the openings inthe burners 28h and openings in the mixing chambers 95 may f be trapped,to prevent such air from reaching the manifold chamber 9i and vsupplyconduit 2.41).

In the embodiment disclosed'in Figures ll and 12, the heatingmeansherein disclosed are particularly adapted for use in furnaceshaving a circular and relatively small fire-box. The heating meanscomprises a manifold |86, forming a generally circular chamber l t i.The chamber lill has its'outer wall, adjacent the upper extremitythereof,v locally interrupted, as shown at m2. j Communicating with eachof the interrupted portions m2 is a radially extending chamberedhousingm3, integrally formed with the manifold |00, andintegrally formed witheach housing- N3 is a semi-spherical ehambered member iiili, providing amixing chamber lilli.' Communication from the manifold chamber lili tothe mixing chamber W5 is provided by means of an orice nozzle |06.

Burner members 23o and baffle means 64C cooperate with each manifoldchamber in a manof the manifold chamber lill., :As shown in Figure l2,the side wall of the chamber lill is provided with a screw-threaded,aperture lill which is normallyclosed by a plug i538, and the fuelsupply conduit 24o may in some instances be connected tothe apertureill'l.

The baffle means 612C, by reas-on of their `tongue` and grooveconnection7 form algenerally an.- nular baille to direct the `flamesissuing from the burner opening 54e towards the Walls of the nre-box, Asbefore, aplate 82,0v is secured to the ledges 59e ofthe channels 58C,and a f plate 83o is supported by theledges provided by the abutments 'l|c formed on the baille means Stic. It will be appreciated that thebaffle means 54e do not provide a` complete annular construction., butif such construction is desired,

' the end baiilemeans 64o adjacent theplug Hi8l may be elongatedlaterally to close the gap. However, in this instance, the bafflemeansvare all made of the same size and the gap formed is preferablydisposed adjacent the door opening into the fire-box. To preventsecondary air 'from following a courseother than through the chambers@9c in the baille means 64o, a suitable plate lliiis secured to theplates i220 and 83e andy closes the short circuiting air gap between theupper and lower chambers of the furnace. v

The ventire heating construction, including the supply conduit Zilc,manifold |09, burner niembers 28e and baffle meansilic, is adjustablevertically of the furnace, as before, by an adjustable standard means19e'.

. The operation of the embodiment disclosed in Figures ll `and l2k issimilar to that described in connection with' the embodiment disclosedin Figures 8 ,tllrollgll l0, in .thatthe Walls of the manifold chamberIl adjacent-the'interrupted portions prevent flash back of flame to themanifold chamber 10|, and the chambers in the housings l03 prevent airfrom infiltrating to the manifold chamber IUI.

From the foregoing it will be apparent to those skilled in the art thatthe illustrated embodiments of my invention provide new and improvedheating devices, and accordingly, accomplish at least the principalobject of my invention. It further will be obvious to those skilled inthe art that the illustrated embodiments of my invention may be-Ivariously changed and modified without departing fromthe spirit ofbaiile means having a passage for supplying secondary air to a pointadjacent the outlet of said burner, said passage being so constructedand arranged that said secondary air supply is independent of saidprimary air supply.

2. Heating means', comprising: a manifold, connectible to a sourceoffluid-fuel supply; means providing a mixing chamber, Vsaid chambercommunicating4 with the interior of said manifold and receiving fuelfrom said manifold, and having means for supplying primary air to'wthinsaid mixing chamber for mixing with the fuel within said, mixingchamber; a burner, connected to said mixing chamber, receiving themixture of fuel and primary air from said mixing chamber; and a member,constructed and arranged to direct the heat energy provided 'by theflame atthe burner outlenand. be heated bythis heat energy, said memberhaving` a conduit terminating above the yburner outlet, for supplyingsecondary air, independent of said primary air supply, to the flame andthe products of combustion rising from the flame, the secondary airbeingV heated by its passage through said ,conduit -and j orovidingcombustion of substantially all combustible material from the flame atthe burner outlet.

3. Heating means, Comprising: a burner, having `spacedapart abutments; adirecting member, for directing heat energy provided by tho iiame`atsaid burner, having a portion disposed between said abutments, andbearing upon burner, said portion being of a thickness, less than thespacing of said abutments, said ber being so constructed and arranged tobe normally urged to a position wherein said portion engages surfaces ofeach of said abutments; and adjustable means', constructed and arrangedto engage said portion in certain adjusted positions, to urge saidportion away from engagement with the surface of one of said abutments,and thereby change the position of said directing member.

4. Heating means, comprising: a burner, having spaced-apart abutments,one of said abutments having a screw-threaded. aperture; a directingmember, for directingheat energy provided by the flame at said burner,having a leg disposedbetween saidY abutments, and bearing upon saidburner, said leg being of a thickness less than the spacing `of saidabutments, and said memberbeing so constructed and arranged to be biasedto an inclined position wherein a portiongenerally overli'es the burnermouth and said leg is in athwart relation with respect to saidabutments; and an adjusting screw, threadedthrough said screw-threadedaperture, for engaging said leg in certain adjusted positions to move"said leg out of engagement with the abutment carrying said screw, andmove said direct'- ing member toa differently inclined position.

5. Heating means, comprising: amanifold device, providing a manifoldchamber connectable to a source of fuel supply, a mixing chamber hav-`ing an orifice opening establishing communication with said manifoldchamber, and a trough interposed between -said mixing chamber and saidmanifold chamber, and forming at least a part of the conduit throughwhich fuel must pass when flowing from said manifold chamber `to saidmixing chamber. a

6`.` Heating means, comprising: a `manifold device, providing a manifoldchamber connectable to a source of fuel supply, a mixing chamber having`an orifice opening in a defining wall establishing communication withsaid manifold chamber, and a trough `within said device and interposedbetween said mixing chamber and said manifold chamber, and forming atleast a part of the conduit that fuel must flow through when passingfromr said manifold chamber to said mixi ing chamber, said troughcomprising saiddening wall and a wall spaced therefrom, said spaced wallextending above said orifice opening.

'7. Heating means, comprising: manifold means, connectable to asource offuelsupply;

` mixing chamber means, receiving fuel from said `manifold means, andbeing apertured` to admit air to said mixing chamber so that the airmaybe mixed with fuel from said manifold means to 'fc-rm a combustiblemixture; burner means, receiving the combustible mixture from saidmixing k chamber, and having a burner opening at which said combustiblemixture is burned; and means,

interposed between said mixing chamber means and said manifold means,constructed and arranged to provide an air seal when flow of fuel` tosaid manifold means is interrupted, said air seal being positioned tointerrupt fuel remaining in said manifold means from flowing into saidmixing chamber means.

` 8. Heating means, comprising: ma nif old means, connectable to asupply of gaseous fuel that is lighter than air; mixing chamber means,having an orifice opening providing for the passage of` fuel from saidmanifold means to said mixing lchamber, and being apertured to admitvair to said mixing chamber so that the air may` be mixed with fuel fromsaid manifold means to form a combustible mixture; burner means, re-

ceiving the combustible mixture from said mixing chamber, and having aburner opening at which said combustible mixture is burned; and troughmeans, interposed between said manifold means and the orifice opening insaid mixing chamber means, constructed and arranged to provide an airseal when flow of `fuel to said manifold means is interrupted, said airseal extending around said orifice opening to seal said opening, therebypreventing the lighter gaseous fuel remaining in said manifold meansfrom flowing into said mixing chamber means.

9. Heating means, comprising: m a n i f o 1 d means, adapted to receivea gaseous fuel that is combustible mixture from said mixing chamber,

and having a burner opening at which said combustible mixture is burned;and trough means, interposed between said manifold means and the orificeopening in said` mixing chamber means, and comprising a lipso positionedthat the gasecus fuel must flow upwardlyfrom saidmanifold means, oversaid lip, and then downwardly to said orifice` opening, the top of saidlip beingat a higher level than said orifice opening, said trough meansfilling with" air whenilow of fuel to said manifold means isinterrupted, thereby providingan air seal extending above said oriceopening to seal said opening, whereby the. lighter gases are preventedfroinflowing downwardly to said orifice opening. I

10. Heating means, `comprising: a` manifold, connectable to a source `offuel supply; mixing `chamber means, having 1an opening providingfor `thepassage of f uel from said manifold to said mixing chamber, and being`apertured to admit air.

movable with respect to said burner opening, di-

recting the heat energy provided bythe flame at the burner opening, andbeing heated by this heat energy, said baille meansV being hollow andopen at thebottom and the top," and the top being positioned-above theburner opening, whereby air is drawn inwardly of the bottom of saidbaffle means and passes, through said hollow baille means and is heated,and passes outwardly at the top and into the pathof the' products ofcombustion rising from the `burner opening, thereby effectingsubstantially complete combustion.

11; A furnace, comprising: a lire-box; manifold means, connectable to asource of fuel supply; means, providing a mixing 4chamber communicatingwith said manifold means, andhaving a regulatable opening through whichprimary air may pass to be mixedL with the fuel in said mixing chamber;burner means, communicating with said mixing chamber, and having aburner opening positioned adjacent the defining wall of said nre-box;chamberedbaie means, extending upwardly with respect tosaid burneropening, for directing the heat energy from said burner opening towardsaid defining wall, said baffle means being open at its bottom and topand having its top above the burneropening, so that secondary airmay'pass throughsaid baille means and into the path of the products ofcombustion rising` from said burner opening; and., plate means,

so constructed and arranged' that air rising from the lower portion `ofsaid fire-box may pass to the opening in said mixing chamber means, orto the chamber of said baille means independently of said mixingchamber.

l2. Heating means, comprising: burner means, lconnectable to a source offuel supply, having 30 l ter, saidwall having means forreceiving the end-tion rising from said burner opening means.

13. Heating means, comprising: a single casting, providingan elongatedmanifold chamber adapted to be connected to a source of fuel, andproviding also a plurality of hollow bell-shaped portionsspaced-apartfalong the `length of said manifold chamber, eachbell-shaped portion being closed by a generally plane wall havingopenings adapted to be controlled by a movable shutter, andeach of saidwalls having means for receiving the end of a burner tube, each of saidbell-shaped 'portions communicating with said manifold chamber, andforming a mixing chamber wherein fuel from saidmanifold may be mixedwith air admitted through the openings in the respective wall.

` 14. Heating means, comprising: a single casting, providing anelongated manifold chamber adapted to b e connected to,y a ysource offuel and providing also` a 'pluralityof hollow. bell-shaped portionsprojecting from opposite sides of said manifold chamber,"eachbell-shaped portion being closed by a generally plane wall havingopenings adapted to be controlled by a movable shutof a burner tube, andsaid bell-shaped portion communicating with said manifold chamber, andforming a mixing chamber wherein fuel from said manifold chamber may bemixedwith air admitted through the openings in said wall.

15. In combination: a fire-box; burner means, so constructedand arrangedthat the iiame'at,v

the opening offsaid burner-means is arranged in a line following thedening `wall of said firebox; and directing means, positioned adjacentsaid burner means, comprising a plurality of members, each beingchambered and open at the bottomand top for the passage of air throughthe chambers, said members being arranged side edge to side edge, andeach member havinga tongue at one side edge anda groove at the`- otherVside edge, the tongue of one member `lit-l bottom for the passageof airthrough the chamf ber, the top of each member having a curved lipdirecting the air passing through the respective member in a directiontoward the products of combustion rising from the adjacent burneropening, said members Abeing arranged side edge to side edge to extendsubstantially in vline with the y burner openings, each member having atongue atkone side edge and. a groove at the other side edge, the tongueofv one memberntting into the groove of an adjacent member.

17. Heating means, comprising: a unitary body, having a first portionproviding a manifold chamber adapted to be connected to a source offuel, and having also at least one hollow bellshaped portion projectingfrom said first portion and a wall closing the mouth of said bell-shapedportion,said wall having an opening,` and having also means forreceiving the end'of a burner tube, and the interior of said bell-shapedportion communicating with said manifold chamber and forming a mixingchamber wherein fuel from said manifold chamber may be mixed with airadmitted'through the opening in said wall.

18. Heating means, comprising: a single casting, having-'an integralfirst portion providing a manifold chamber adapted to be connected to asource of fuel, and having also at least one integral' hollowbell-shaped portion projecting from said V`first portion and an integralwall closing the mouth of said-bell-shaped portion, said wall having anlopening, and having also means for receiving the end of a burner tube,and the interior 4of'said bell-shaped portion communicatingwithsaidmanifold chamber and forming a mixing chamber wherein fuel from saidmanifold chamber may be mixed, with air admitted through the opening insaid wall.

19. Heating means, comprising: a unitary body, having an 'arcuate firstportion providing' an arcuate A manifold chamber adapted to be connectedto a source of` fuel, and having also at least' onerhollow bell-shapedrportion projecting from said first portion, and a wall closing themouthof said bell-shapedportion,`said wall having an opening and havingalso means for rreceiving the end of a burner tube, and the interiorofsaid bell-shaped portion communicating with said manifold chamber, andforming a mixing chamber vwherein lfuel from said manifold may be mixedwith air admitted through said wall opening.

20. Heating means, comprising: a unitary body, having an annular firstportion providing an annular'inanifo'ld chamber adapted to be connectedtoa source of fuel, and having also a plup tube, the interior of eachbell-shaped portion, communicating `with said manifold chamber,v

forming individual mixing chambers wherein fuel from said manifold maybe mixed with air admitted through the opening in a respective wall.

CHARLES L.` BRYANT.

